Dave Fasano, Application Scientist, Dow Coating Materials
While wet hiding may not be a good predictor of final dry hiding, it is used as a calibration point for application by contractors and provides the first impression of the paint for homeowners. When reducing TiO2 to control cost and supply, lower wet hiding is reluctantly accepted by formulators. No other raw material provides near the level of wet hiding as TiO2, and as a result, reductions always led to less wet hiding. That is, until now. Pre-composite polymer helps improve both the wet and dry hiding efficiency of TiO2. As a result, similar wet hiding is possible when reducing TiO2 use levels. Reformulation techniques to control wet and dry hiding using pre-composite polymer, along with other TiO2 reduction materials, will be discussed to give formulators new options to manage the overall, wet and dry, hiding of paints.